Quick sanity check: do I need an MPO/MTP trunk for these, or will my standard LC patch cables work?

You’re good to go with your standard LC cables! This transceiver uses a standard Duplex LC interface over Single Mode Fiber (SMF). It multiplexes the 4 wavelengths internally, completely eliminating the need for expensive 8/12-core MPO cabling.

This one says 0°C to 70°C, but some of our edge switches are in un-airconditioned outdoor enclosures. Do you guys make a rugged version?

For extreme outdoor edge nodes, we highly recommend our industrial-grade line. While this LQ-CW40-L24C is perfect for standard indoor setups, you should check out our LQ-CW40-L24I models specifically engineered for harsh -40°C to 85°C environments!

Need to ensure this passes our compliance checks. Is it fully IEEE 802.3ba compliant for enterprise network routing?

Yes! It strictly adheres to IEEE 802.3ba 40GBASE-LR4 and QSFP+ MSA standard protocols, supports Host FEC, and passes all global telecom compliance testing for safe, reliable data center interconnects.

Hey, just verifying if this 40G QSFP+ module will play nice in a mixed rack with both Cisco Nexus and Arista switches?

there! Yes, absolutely. It's fully SFF-8436 MSA compliant and tested rigorously for cross-compatibility with Cisco, Arista, Juniper, and other major OEMs. You won't run into any vendor lock-in or interoperability issues.

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Arista QSFP-40G-LR4-20 Compatible LINK-PP 40G QSFP+ 1310nm 20km Duplex LC DDM SMF Optical Transceiver Module

Name: Arista QSFP-40G-LR4-20 Compatible LINK-PP 40G QSFP+ 1310nm 20km Duplex LC DDM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 219539
Price: 235.64 USD
Availability: InStock
Rating: 5 (33 reviews)

# 219539

Product: Arista QSFP-40G-LR4-20 Compatible LINK-PP 40G QSFP+ 1310nm 20km Duplex LC DDM SMF Optical Transceiver Module
SKU: 219539
P/N: LQ-CW40-L24C
Price: $ 274
Stock: 635 in Stock
Sold: 2.2K
Product URL: https://www.l-p.com/products/482456.htm

For Order Over $1000 Get $15.00 Off , Code: Linkpp15

For Order Over $3000 Get $50.00 Off , Code: Linkpp50

For Order Over $5000 Get $100.00 Off , Code: Linkpp100

New Users: $10 Coupon for Orders , Code: linkpp2610

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Manufacture: LINK-PP

P/N: LQ-CW40-L24C

Compatible:: Cisco; LINK-PP; Arista; Brocade; DELL; Extreme; Generic; H3C; HW; Intel; Juniper; NVIDIA/Mellanox

Compatible P/N:: QSFP-40G-LRL4 | 2km; QSFP-40G-LR4 | 10km; QSFP-LR4-40G-I | 10km; QSFP-40G-LR4-20 | 20km; QSFP-40G-ER4 | 40km

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Arista QSFP-40G-LR4-20 Compatible LINK-PP 40G QSFP+ Specifications

The Arista QSFP-40G-LR4-20 Compatible LINK-PP module is a high-performance 40G QSFP+ transceiver designed for long-reach networking. Compliant with IEEE 802.3ba 40GBASE-LR4 and SFF-8436 standards, this single mode optical module ensures superior data transmission. It features a robust hot-pluggable design, supporting an impressive 40Gbps data rate to meet the demanding specifications of modern data center interconnects.

Arista Part Number	QSFP-40G-LR4-20	Vendor Name	LINK-PP
Form Factor	QSFP+	Max Data Rate	40Gbps
Wavelength	1271nm, 1291nm, 1311nm, 1331nm	Max Cable Distance	20km
Connector	Duplex LC	Media	SMF
Transmitter Type	DFB	Receiver Type	PIN
Operating Temperature Range	0°C to +70°C	Protocols	QSFP+ MSA, SFF-8436
Host FEC	Supported	Power Supply	+3.3V

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Q: Quick sanity check: do I need an MPO/MTP trunk for these, or will my standard LC patch cables work? By K***s on 2026-03-17

A: You’re good to go with your standard LC cables! This transceiver uses a standard Duplex LC interface over Single Mode Fiber (SMF). It multiplexes the 4 wavelengths internally, completely eliminating the need for expensive 8/12-core MPO cabling. By admin on 2026-03-17
Q: This one says 0°C to 70°C, but some of our edge switches are in un-airconditioned outdoor enclosures. Do you guys make a rugged version? By S***n on 2026-02-20

A: For extreme outdoor edge nodes, we highly recommend our industrial-grade line. While this LQ-CW40-L24C is perfect for standard indoor setups, you should check out our LQ-CW40-L24I models specifically engineered for harsh -40°C to 85°C environments! By admin on 2026-02-20
Q: Need to ensure this passes our compliance checks. Is it fully IEEE 802.3ba compliant for enterprise network routing? By L***s on 2026-02-17

A: Yes! It strictly adheres to IEEE 802.3ba 40GBASE-LR4 and QSFP+ MSA standard protocols, supports Host FEC, and passes all global telecom compliance testing for safe, reliable data center interconnects. By admin on 2026-02-17
Q: Hey, just verifying if this 40G QSFP+ module will play nice in a mixed rack with both Cisco Nexus and Arista switches? By A***e on 2025-10-21

A: Hey there! Yes, absolutely. It's fully SFF-8436 MSA compliant and tested rigorously for cross-compatibility with Cisco, Arista, Juniper, and other major OEMs. You won't run into any vendor lock-in or interoperability issues. By admin on 2025-10-21

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D***n

Ireland

Verified Purchase

5 .0

2026-02-24

The CWDM4 technology really saved our single mode fiber cabling costs. Excellent value!

133 Helpful vote Comments

W***z

Ukraine

Verified Purchase

5 .0

2026-02-03

Best Cisco compatible 40G module I've bought.

70 Helpful vote Comments

W***r

Spain

Verified Purchase

5 .0

2025-12-02

Works great in our outdoor cabinet switch.

96 Helpful vote Comments

R***h

Singapore

Verified Purchase

5 .0

2025-11-05

Tested 1311nm wavelength, DOM looks super stable.

69 Helpful vote Comments

A***h

Czech Republic

Verified Purchase

5 .0

2025-09-07

Solid 40G QSFP+ transceiver, DDM reads perfectly.

121 Helpful vote Comments

A***s

Dominican Republic

Verified Purchase

5 .0

2025-07-11

Great commercial temp optical module, cheap too.

62 Helpful vote Comments

D***e

Germany

Verified Purchase

5 .0

2025-06-17

Perfect 20km SMF module for our campus!

162 Helpful vote Comments

M***z

Italy

Verified Purchase

5 .0

2025-05-31

Replaced some pricey OEM units with this 20km SMF module. DDM data shows stable 3.3V draw under load. Perfect for our bulk data center QSFP+ deployment, saving thousands on TCO without sacrificing reliability.

88 Helpful vote Comments

R***k

Switzerland

Verified Purchase

5 .0

2025-05-26

Arista switches accepted these instantly. Zero drops.

181 Helpful vote Comments

T***o

Russian Federation

Verified Purchase

5 .0

2025-02-21

Very nice sales to speak to and knowledgeable on the products they sell!

36 Helpful vote Comments

L***s

Mexico

Verified Purchase

5 .0

2025-01-31

Upgraded our core with this 40G QSFP+ transceiver. Link is solid across 15km!

83 Helpful vote Comments

A***s

United Kingdom

Verified Purchase

5 .0

2025-01-15

DDM stats on these 1310nm 20km modules are accurate. Great for our 10G NAS.

114 Helpful vote Comments

C***n

Argentina

Verified Purchase

5 .0

2025-01-11

20km distance reached without any signal loss!

71 Helpful vote Comments

T***e

Republic of Korea

Verified Purchase

5 .0

2025-01-09

You had what I was looking for. The price was right. Shipping cost low. Shopping experience intuitive and quick.Thanks!

55 Helpful vote Comments

V***e

Indonesia

Verified Purchase

5 .0

2024-12-28

I am proud to e a customer of Fiberstore.

81 Helpful vote Comments

S***z

Ethiopia

Verified Purchase

5 .0

2024-12-10

Our team required a reliable Cisco compatible 40G link for an 18km base station backhaul. This 1310nm optical transceiver delivered ultra-low latency instantly. Truly a robust solution for large-scale enterprise routing and switching.

192 Helpful vote Comments

L***n

United States

Verified Purchase

5 .0

2024-11-30

Smooth Infiniband QDR connectivity. Running these in a Juniper chassis without a hitch.

69 Helpful vote Comments

Y***p

Denmark

Verified Purchase

5 .0

2024-11-30

Great site and great company to do business with. Website is easy to navigate and reviews always very helpful with purchases.

22 Helpful vote Comments

M***z

Japan

Verified Purchase

5 .0

2024-11-29

Packing and delivery very good. All went well.

45 Helpful vote Comments

A***i

Poland

Verified Purchase

5 .0

2024-11-20

Very easy to navigate and easy ordering process.

20 Helpful vote Comments

B***m

France

Verified Purchase

5 .0

2024-11-12

Timely delivery. Item as expected, worked well.

13 Helpful vote Comments

H***r

Hong Kong

Verified Purchase

5 .0

2024-06-08

I got exactly what I wanted and received them in a very timely manner. Satisfied

53 Helpful vote Comments

A***i

Morocco

Verified Purchase

5 .0

2024-05-22

Every thing went smooth. I had a question and called, they helped me right away.

41 Helpful vote Comments

H***n

Russian Federation

Verified Purchase

5 .0

2024-04-09

We had a large volume for 10/25/40G Transceiver Modules each month.always had good performance. This time our Account Manager told me that it had a big price reduction, so we purchased some more which can be used for six months. Surprisingly, we received the goods quickly. That's great.

85 Helpful vote Comments

B***r

United States

Verified Purchase

5 .0

2024-03-17

Nice, but to our suprise, this cheap magnetics has 3 layer of packaging. But it is good for us.

24 Helpful vote Comments

Y***p

Canada

Verified Purchase

5 .0